Starting on CNL we now need to map VBT DDC Pin to
BSPec DDC Pin values. Not a direct translation anymore.
According to VBT
Block 2 (General Bytes Definition)
DDC Bus
+----------+-----------+--------------------+
| DDI Type | VBT Value | Bspec Mapped Value |
+----------+-----------+--------------------+
| DDI-B | 0x1 | 0x1 |
| DDI-C | 0x2 | 0x2 |
| DDI-D | 0x3 | 0x4 |
| DDI-F | 0x4 | 0x3 |
+----------+-----------+--------------------+
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Cc: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
Cc: Anusha Srivatsa <anusha.srivatsa@xxxxxxxxx>
Cc: Clinton Taylor <clinton.a.taylor@xxxxxxxxx>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_bios.c | 32 ++++++++++++++++++++++----------
1 file changed, 22 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index dc4fad30bf4f..e0e59cd52766 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -1071,6 +1071,24 @@ static void sanitize_aux_ch(struct drm_i915_private *dev_priv,
}
}
+#define DDC_BUS_DDI_B 0x1
+#define DDC_BUS_DDI_C 0x2
+#define DDC_BUS_DDI_D 0x3
+#define DDC_BUS_DDI_F 0x4
+
+static u8 cnl_ddc_pin_map(u8 ddc_pin)
+{
+ switch (ddc_pin) {
+ case DDC_BUS_DDI_B: return 0x1;
+ case DDC_BUS_DDI_C: return 0x2;
+ case DDC_BUS_DDI_D: return 0x4;
+ case DDC_BUS_DDI_F: return 0x3;
+ default:
+ MISSING_CASE(ddc_pin);
+ return ddc_pin;
+ }
+}
+
static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
u8 bdb_version)
{
@@ -1164,16 +1182,10 @@ static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port));
if (is_dvi) {
- info->alternate_ddc_pin = ddc_pin;
-
- /*
- * All VBTs that we got so far for B Stepping has this
- * information wrong for Port D. So, let's just ignore for now.
- */
- if (IS_CNL_REVID(dev_priv, CNL_REVID_B0, CNL_REVID_B0) &&
- port == PORT_D) {
- info->alternate_ddc_pin = 0;
- }
+ if (IS_CANNONLAKE(dev_priv))
+ info->alternate_ddc_pin = cnl_ddc_pin_map(ddc_pin);
+ else
+ info->alternate_ddc_pin = ddc_pin;
sanitize_ddc_pin(dev_priv, port);
}
--
2.13.5
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